RTFF - where the last F stands for forum rules. Of course, if anyone labels ALL Muslims as terrorists that would of course be extremely pejorative and would be counter to the F Forum rules. Least you are alluding to the phrase "The extremist Muslims", let me assure you that extremist does not mean a terrorist and by the use of the definite article 'the', Dr Turbo is referring solely to those subset of Muslims who are extremists. Just as we refer to extremist Christians (the right of the Reptard Part) etc.
Speaking as myself and not as mod or admin.
- Dr Zunaid Bhai
PS. The rules are available at the top menu and will explain all.